It seems like $value defined by parameter $value on line 32 can also be of type boolean; however, BrowscapPHP\Data\Propert...er::checkValueInArray() does only seem to accept string, maybe add an additional type check?
This check looks at variables that have been passed in as parameters and are passed out again
to other methods.
If the outgoing method call has stricter type requirements than the method itself, an issue is raised.
The break statement is not necessary if it is preceded for example by a return statement:
If you would like to keep this construct to be consistent with other case statements, you can safely mark this issue as a false-positive.